MODEL 211A
SQUARE WAVE GENERATOR
Manual Serial Prefixed: 026-
Manual Printed: 4/62
To adapt this manual to instruments with other serial prefixes check for errata below, and make
changes shown in tables.
Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes
Applies to all
serial prefixes ERRATA
ERRATA: Figure 4-8, Multivibrator and Power Supply,
F1 and S3: Reverse positions show to F1 connected between S3 and PI.
R30: Add asterisk beside R30 and change value to 75K.
Figure 4-9, Output Section,
S2: Add arrowhead on switch contact which connects 60 DB section of S2 to 7552 OUTPUT
connector 52.
Table 5-1, Reference Designation Index,
CR1: Change to Diode, Ge, @ Stock No. 1910-0016.
R30: Change to Resistor, fixed, deposited carbon, 75K ohms *l%, 1W. Optimum value
selected at factory; average value shown. @ Stock No. 0730-0058.
V2, V3: Change @ Stock No. to 1923-0066.
V5: Change @ Stock No. to 1921-0030.
V6 thru V11: Change ($9 Stock No. to 1923-0067.
Table 5-2, Replaceable Parts,
0730-0065: Change to 0730-0058; R: fxd, dep c, 75K* ohms *l%, 1W.
1910-0009: Change to 1910-0016; Diode, Ge; Mfr. 28480; Mfr. Part No. 1910-0016.
1921-0005: Change to 1921-0030; Tube, electron: 6C4; Mfr. 86684.
1923-0030: Change to 1923-0066; Tube, electron: 6CL6; Mfr. 86684; Te2; Rs2.
Add 1923-0067; Tube, electron: 6CL6; Mfr. 82219; Mfr. Part No. 6CL6; TQ=6; RS6.
Under MISCELLANEOUS,
Change: AC-1OC to 5060-0632
AC-1OD to 5060-0633
G-74K to 0370-0032
G-74N to 0370-0035
G-74 Z to 0370-0045
G-99K to 5040-0600
Section IV: Add paragraphs 4-43 and 4-44 on page 4-8,
4-43. AIR FILTER
4-44. Inspect air-filter element periodically. Clean element before air flow is
restricted and instrument overheats. as Proceed follows:
a. Remove element and wash in detergent and water.
b. Dry element thoroughly.
c. Coat element with light film of filter oil (adhesive) before filter installing
in instrument. Research Products Company No. 3 Filter Coat is recommended.
This adhesive is available in "Handi-Koter" sprayer cans at most heating supply
stores or from your local Hewlett-Packard sales office.
d. Install cleaned and coated air-filter element instrument. in
Supplement A for
211A-900 |